成为一颗“枯竭”的彗星意味着什么？McDonald天文台对21 P/Giacobini-Zinner原型彗星的高光谱分辨率观测
What Does It Mean to be a "Depleted" Comet? High Spectral Resolution Observations of the Prototypical Depleted Comet 21P/Giacobini-Zinner from McDonald Observatory
摘要：
我们在2018年的六个晚上对21 P/Giacobini-Zinner彗星进行了高光谱分辨率的光学观测。这些观测是由麦克唐纳天文台的2.7米哈伦·J·史密斯望远镜上的图尔Coude摄谱仪获得的。这颗彗星的光谱显示出C $_2$、C $_3$、CH和NH $_2$相对于CN的强烈消耗。我们探讨这意味着什么彗星被耗尽，并表明，所有的物种都存在于光谱中类似的相对线强度内的一个分子带相比，一个典型的彗星。这种消耗表明所研究物种的丰度要低得多。
英文摘要：
We present high spectral resolution optical observations of comet 21P/Giacobini-Zinner from six nights in 2018. The observations were obtained with the Tull coude spectrograph on the 2.7m Harlan J. Smith Telescope of McDonald Observatory. This comet's spectrum shows strong depletions in C$_2$, C$_3$, CH, and NH$_2$ relative to CN. We explore what it means for a comet to be depleted and show that all of the species are present in the spectrum at similar relative line intensities within a a molecular band compared with a typical comet. The depletions represent a much lower abundance of the species studied.
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